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2 years ago

How many valence electrons does rubidiumn have?

Chemistry

1 answer:

vlada-n [284]2 years ago

7 0

Answer:

Explanation:

I believe it really only has 1 valence electrons

You might be interested in

How many liters of carbon dioxide gas are there in 4 moles of CO2 at STP?

Ad libitum [116K]

Answer:

89.6 L

Explanation:

In normal conditions,

For every 1 mole of carbon dioxide at STP, it occupies 22.4 L of volume.

============================================================

Solving :

⇒ 1 mole : 22.4 L

⇒ 1 × 4 : 22.4 × 4

⇒ 4 moles : 89.6 L

4 0

2 years ago

How many significant digits are in the number 125,001?

Yuri [45]

The number of significant digits in the number 125,001 are: 6.

Significant digits are always:
1. non-zero
2. Any zeros between two significant digits are significant (for example 5 and 1)
3. A final zero or trailing zeros in the decimal portion only are significant.

Hope I helped!

5 0

3 years ago

An 18-g sample of element A combines completely with a 4-g sample of element B to form the compound AB. What is the mass of the

DaniilM [7]

Answer:

22g

Explanation:

Given parameters:

Mass of element A = 18g

Mass of element B = 4g

Unknown:

Mass of compound formed = ?

Solution:

The reaction equation is given as;

A + B → AB

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".

Simply mas is conserved and the mass of the reactants is the same as the mass of the product that forms.

Mass of reactants = mass of A + mass of B = 18g + 4g = 22g

So;

Mass of product AB = 22g

6 0

2 years ago

Explain the connection between energy quanta and energy levels.

GaryK [48]

A quantum (plural, quanta) is the minimum amount of energy that can be absorbed or released by matter. It is a discrete, or distinct, amount of energy. ... Thus, they can occupy only fixed energy levels around the nucleus that correspond to quantum increases in energy.

7 0

3 years ago

Iron is found in Earth's crust as several iron compounds. Calculate the mass in kilograms of the amount of each of the following

myrzilka [38]

2074.74 kg is the mass of siderite in which 1x10^3 kg of iron is present.

Explanation:

Mass of iron is given as 1x10^3 Kg

mass of iron in siderite FeCO3 can be known

number of moles in 1x10^3 Kg iron is calculated by the formula.

number of moles = $\frac{mass}{atomic mass of one mole}$

atomic weight of iron is 55.84

number of moles = $\frac{1000.1000}{55.84}$

n= 17908.309 moles of iron in 1000 kg

1 mole of FeCO3 has 1 mole of Fe

x moles of FeCO3 will have $\frac{x}{17908.309}$ moles

$\frac{1}{1}$ = $\frac{x}{17908.309}$

x = 17908.309 moles of FeCO3 is there.

so mass can be calculated as number of moles x molar mass of one mole of the substance. (molar mass of siderite is 115.854 grams/mole)

17908.309 x 115.854

= 2074749.230 grams of siderite

(the molar mass is converted to kg/mole as the mass of iron is given by kg.

0.1158 kg is the molar mass of siderite)

2074749.230 grams of siderite is converted to kilogram

2074.74 kg is the mass of siderite in which 1x10^3 kg of iron is present.

4 0

3 years ago